Vehicle lamp fault detection system and vehicle
By combining photosensitive, thermal, and electrical signal detection modules with multi-dimensional signal acquisition from the vehicle lighting control module, the problem of existing vehicle lighting fault detection devices being unable to accurately distinguish fault levels has been solved. This enables precise diagnosis and location of vehicle lighting fault types, improving detection effectiveness and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 河北长征汽车制造有限公司
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-24
AI Technical Summary
Existing headlight fault detection devices cannot accurately distinguish fault levels and risk levels, making it difficult for drivers to determine whether they need to stop immediately for repairs or whether they can continue driving safely. Furthermore, maintenance personnel must use a trial-and-error method to troubleshoot each fault point.
Multi-dimensional signal acquisition is achieved by using a photosensitive module, a thermal module, and an electrical signal detection module. Fault type detection is performed in conjunction with the vehicle light control module. Hardware-level rapid identification is achieved by configuring four comparators. The parallel processing architecture ensures that multiple faults are reported simultaneously. Fault location identification is achieved by combining with the positioning module.
It enables accurate diagnosis of vehicle light fault types, reduces the risk of misdiagnosis during maintenance, improves fault location efficiency, and builds an active safety protection system to avoid potential traffic accidents.
Smart Images
Figure CN224553458U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle lighting control technology, and in particular to a vehicle lighting fault detection system and vehicle. Background Technology
[0002] In modern transportation systems, vehicle lights, as a core component for safe vehicle operation, undertake multiple functions including illumination, signal transmission, and environmental perception. When driving at night, the illumination range of headlights directly affects the driver's ability to judge road conditions, while auxiliary lights such as side marker lights, turn signals, and brake lights are the "language system" for the vehicle to interact with the outside world, and their reliability is directly related to the incidence of traffic accidents.
[0003] Current mainstream in-vehicle systems generally employ a binary status detection mechanism, which only provides feedback to the user through fault indicator lights (such as a "bulb failure" warning) or simple text prompts (such as "left rear light failure"). While this simplified information presentation method meets basic fault warning needs, it exposes several deeper problems in practical applications. For example, the single "fault / normal" binary feedback cannot distinguish between fault severity and risk level. For instance, both a blown brake light filament and a communication interruption in the control module are displayed as "brake light failure" on the dashboard, but the former may lead to a rear-end collision, while the latter may cause the entire vehicle's lighting system to malfunction. Without specific fault information, drivers find it difficult to determine whether immediate repair is necessary or whether safe driving is still possible. Furthermore, the binary detection mechanism cannot provide fault location information, requiring repair personnel to troubleshoot potential fault points one by one using a trial-and-error approach. Therefore, the detection effectiveness of existing vehicle lighting fault detection devices is relatively poor. Utility Model Content
[0004] This application provides a vehicle headlight fault detection system and vehicle to solve the problem of poor detection effect of existing vehicle headlight fault detection devices.
[0005] In a first aspect, this application provides a vehicle headlight fault detection system, including: a photosensitive module, a thermal module, an electrical signal detection module, and a vehicle headlight control module; The photosensitive module is used to detect the light intensity signal of the target vehicle's headlights; The thermal module is used to detect the temperature signal of the target vehicle light; The electrical signal detection module is used to detect the electrical signal when the target vehicle light is working; The vehicle headlight control module is used to detect the fault type of the target vehicle headlight based on the light intensity signal, the temperature signal, and the electrical signal; The target vehicle lights include headlights, signal lights, and auxiliary driving lights.
[0006] As can be seen from the above embodiments, this embodiment, through multi-dimensional signal acquisition using a photosensitive module, a thermal module, and an electrical signal detection module, can achieve accurate diagnosis of vehicle headlight fault types. Specifically, the photosensitive module detects light intensity signals to directly determine whether the bulb is emitting light normally; the thermal module monitors temperature changes in the target headlight to identify abnormal heat dissipation or short-circuit hazards; and the electrical signal detection module analyzes electrical signal fluctuations to locate circuit faults. The headlight control module integrates these three types of signals, overcoming the limitations of traditional binary detection, and can distinguish between different types of headlight faults, thereby significantly improving the headlight fault detection effect.
[0007] In one possible implementation, the electrical signal includes a voltage signal and a current signal; the electrical signal detection module includes a current sensor and a voltage sensor; the vehicle headlight fault detection system further includes a first comparison module, a second comparison module, a third comparison module, and a fourth comparison module. The inverting input terminal of the first comparison module is connected to the output terminal of the photosensitive module, the non-inverting input terminal of the first comparison module is used to connect to the light intensity reference signal, and the output terminal of the first comparison module is connected to the vehicle lamp control module. The non-inverting input of the second comparison module is connected to the output of the thermistor module, and the inverting input of the second comparison module is connected to the thermistor reference signal; the output of the second comparison module is connected to the vehicle lighting control module. The non-inverting input terminal of the third comparison module is connected to the output terminal of the current sensor, the inverting input terminal of the third comparison module is used to input the current reference signal, and the output terminal of the third comparison module is connected to the vehicle lighting control module. The inverting input terminal of the fourth comparison module is connected to the output terminal of the voltage sensor, the non-inverting input terminal of the fourth comparison module is used to receive a voltage reference signal, and the output terminal of the fourth comparison module is connected to the vehicle lighting control module.
[0008] As can be seen from the above embodiments, this embodiment achieves rapid hardware-level fault diagnosis by configuring four comparators with differentiated input polarities. The first comparator uses an inverting input to compare the light intensity signal with a reference value, and immediately outputs a high level when the light intensity is insufficient; the second comparator is connected to the temperature signal with a non-inverting input, and triggers an alarm when the temperature exceeds the limit; the third and fourth comparators monitor the overcurrent and undervoltage states of current / voltage, respectively. Each comparator works independently and directly outputs a digital signal to the vehicle lighting control module, eliminating the analog-to-digital conversion stage and improving response speed.
[0009] In one possible implementation, the headlight control module is configured to trigger a light decay fault in the target headlight when it receives a high-level signal from the first comparison module; trigger an overheating fault in the target headlight when it receives a high-level signal from the second comparison module; trigger an overcurrent fault in the target headlight when it receives a high-level signal from the third comparison module; and trigger an undervoltage fault in the target headlight when it receives a high-level signal from the fourth comparison module.
[0010] As can be seen from the above embodiments, this embodiment can achieve accurate fault location by establishing a hard-wired mapping relationship between the comparator output level and the fault type. This mechanism allows the controller to classify the four types of core vehicle light faults without parsing complex analog quantities, simply by identifying high and low levels. The diagnostic latency is small, and the parallel processing architecture can ensure that multiple faults are reported simultaneously, avoiding missed reports caused by traditional polling mechanisms.
[0011] In one possible implementation, the headlight fault detection system further includes an AND gate; The first input terminal of the AND gate is connected to the output terminal of the first comparison module, the second input terminal of the AND gate is connected to the output terminal of the fourth comparison module, and the output terminal of the AND gate is connected to the vehicle light control module. The vehicle light control module is used to trigger a partial lamp chip damage fault in the target vehicle light when it receives a high-level signal sent by the AND gate.
[0012] As can be seen from the above embodiments, in this embodiment, when the first comparator and the fourth comparator simultaneously output a high level, the AND gate sends a high-level signal to the vehicle lighting controller, triggering a "partial lamp bead damage" fault. This structure accurately captures the common fault type in the lamp assembly where a single lamp bead is open-circuited, resulting in a decrease in overall voltage and a reduction in light output. Through a dual-condition constraint mechanism, it effectively eliminates the problems of reduced light intensity caused by external blockage of the lamp beads and false undervoltage alarms caused by power supply failures. Furthermore, compared to high-cost image recognition solutions, this embodiment achieves the same function with a single logic gate device, reducing costs and improving maintenance efficiency.
[0013] In one possible implementation, the headlight fault detection system further includes an OR gate; The first input terminal of the OR gate is connected to the output terminal of the second comparison module, the second input terminal of the OR gate is connected to the output terminal of the third comparison module, and the output terminal of the OR gate is connected to the vehicle light control module. The headlight control module is used to trigger an overheating fault in the target headlight when it receives a high-level signal sent by the OR gate.
[0014] As can be seen from the above embodiments, this embodiment integrates temperature and current signals through an OR gate to construct a dual-redundancy judgment mechanism for overheating faults. Since current overload is the direct cause of overheating, and temperature rise is the final manifestation of overheating faults, this embodiment significantly improves the reliability of fault judgment through dual signals.
[0015] In one possible implementation, the vehicle light fault detection system further includes a positioning module; the positioning module is used to detect the position information of the target vehicle light and send the position information of the target vehicle light to the vehicle light control module.
[0016] As can be seen from the above embodiments, the positioning module provided in this embodiment can accurately identify the physical location of the faulty vehicle light. By obtaining the location information of the target vehicle light, such as the left front low beam headlight and the right rear turn signal, the controller can bind the fault type with the specific location, avoiding maintenance personnel from checking each light individually and improving the positioning efficiency of the faulty vehicle light.
[0017] In one possible implementation, the headlight fault detection system further includes a body controller and a vehicle control module; The body controller is communicatively connected to the headlight control module, and the vehicle control module is communicatively connected to the body controller. The body controller is used to obtain the fault type sent by the headlight control module and forward the fault type to the vehicle control module.
[0018] As can be seen from the above embodiments, this embodiment constructs a multi-level fault response mechanism through the body controller and the vehicle control module. The headlight control module transmits the fault type to the vehicle control module through the body controller, providing signal support for corresponding safety strategies for subsequent headlight faults.
[0019] In one possible implementation, the vehicle lights also include hazard warning flashers; The vehicle control module is also used to restrict the vehicle's transmission from shifting to a high gear and to activate the hazard warning lights when the target headlights overheat.
[0020] As can be seen from the above embodiments, this embodiment interlocks headlight malfunctions with the transmission, constructing an active safety protection system. When an overheating fault is detected in the headlights, the vehicle control module immediately restricts the transmission from entering high gears, preventing traffic accidents or serious loss of control of the power system caused by headlight circuit failures, and effectively avoiding potential electrical fire risks.
[0021] In one possible implementation, the system further includes: a display module; The display module is communicatively connected to the vehicle control module and is used to display the fault type of the target vehicle light.
[0022] As can be seen from the above embodiments, this embodiment can intuitively display the type of target vehicle light malfunction through the display module; reducing the risk of driver misjudgment and improving emergency response efficiency.
[0023] Secondly, this application provides a vehicle comprising: a headlight fault detection system as described in any of the first aspects above. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of the vehicle headlight fault detection system provided in the embodiments of this application; Figure 2 This is a schematic diagram of the specific structure of the vehicle headlight fault detection system provided in the embodiments of this application. Detailed Implementation
[0026] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.
[0027] In the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0028] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.
[0029] Furthermore, the term "multiple" mentioned in the embodiments of this application should be interpreted as two or more.
[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.
[0031] In modern transportation systems, vehicle lights, as a core component for safe vehicle operation, perform multiple functions including illumination, signal transmission, and environmental perception. When driving at night, the illumination range of headlights directly affects the driver's ability to judge road conditions, while auxiliary lights such as parking lights, turn signals, and brake lights serve as the vehicle's "language system" for interacting with the outside world, and their reliability directly impacts the incidence of traffic accidents. Therefore, timely detection and repair of vehicle light malfunctions are of paramount importance.
[0032] Currently, while conventional binary state detection mechanisms can quickly detect headlight malfunctions, they only provide a warning function when signal lights malfunction, without specifying the type of malfunction. This prevents drivers from effectively distinguishing which malfunctions require immediate attention and which can be addressed later, causing unnecessary anxiety for vehicle operators. Furthermore, when malfunctions such as brake lights or hazard lights fail to illuminate, without proactive intervention in the vehicle's operating system, drivers may delay repairing the faulty lights, leading to misjudgments by drivers of following vehicles and potentially causing accidents. For these reasons, the current headlight malfunction detection system suffers from an inability to accurately categorize signal light malfunctions, hindering drivers from taking appropriate and targeted actions, resulting in unsatisfactory headlight malfunction detection performance.
[0033] To address the aforementioned problems, this embodiment provides a vehicle headlight fault detection system. Figure 1 This is a schematic diagram of the structure of the vehicle headlight fault detection system provided in the embodiments of this application, as shown below. Figure 1 As shown, the vehicle headlight fault detection system includes: a photosensitive module 10, a thermal module 20, an electrical signal detection module 30, and a vehicle headlight control module 40; The photosensitive module 10 is used to detect the light intensity signal of the target vehicle light; The thermal module 20 is used to detect the temperature signal of the target vehicle light; The electrical signal detection module 30 is used to detect the electrical signal when the target vehicle light is working; The vehicle headlight control module 40 is used to detect the fault type of the target vehicle headlight based on the light intensity signal, the temperature signal and the electrical signal; The target vehicle lights include headlights, signal lights, and auxiliary driving lights.
[0034] Specifically, the lighting includes headlights, fog lights, and reversing lights. Headlights include high beams, low beams, adaptive headlights, matrix LED headlights, and laser headlights. Fog lights include front fog lights and rear fog lights. Signal lights include turn signals, brake lights, position lights, and hazard warning lights. Auxiliary driving lights include daytime running lights, license plate lights, and interior lights.
[0035] The target headlight can be one or more of the aforementioned headlights. In this embodiment, a signal detection module can be arranged at each headlight of the vehicle, including the aforementioned photosensitive module 10, thermal module 20 and electrical signal detection module 30, for collecting the photosensitive signal, thermal signal and electrical signal of the headlight.
[0036] The photosensitive module 10 monitors the luminous intensity of the target vehicle lamp. This luminous intensity detection is compared with a corresponding luminous intensity range to determine whether the lamp has experienced a dimming or light decay fault. The thermal module 20 is used to detect overheating faults caused by internal short circuits in the target vehicle lamp. The electrical signal detection module 30 collects the voltage, current, and / or power values of the target vehicle lamp. The voltage value can detect partial lamp chip damage, and the current value can detect overcurrent faults in the lamp.
[0037] In this embodiment, the headlight control module 40 can be a microcontroller unit (MCU). By collecting feedback changes of parameters such as the photosensitive module 10, the thermal module 20, and the electrical signal detection module 30, and analyzing and comparing them with the reference values, the processing results of different fault types can be determined. It can accurately determine the causes of various faults in the headlights and then issue different instructions.
[0038] Specifically, the headlight control module 40 acquires light intensity signals, temperature signals, and electrical signals. It also acquires the light intensity data corresponding to the light intensity signal. When the light intensity data exceeds the normal light intensity range, it determines that the target headlight has a light decay fault. When the light intensity data of the target headlight is zero, it considers the target headlight to be off. The module extracts the temperature value from the temperature signal. When the temperature value exceeds a preset temperature range, it determines that the target headlight has an overheating fault. It also extracts the electrical parameters from the electrical signal. When the electrical parameters exceed a preset electrical parameter range, it determines that the target headlight has a partial lamp chip damage / overcurrent fault.
[0039] Specifically, the headlight control module 40 can detect the fault type of the target headlight based on a single signal, or it can combine multiple signals to monitor the fault type of the target headlight.
[0040] As a specific embodiment, if the thermal module 20 detects that the temperature of the target headlight exceeds the preset temperature range, the headlight control module 40 directly outputs an overheating fault type regardless of whether the electrical parameters are normal. If a short circuit fault is detected in the target headlight based on the electrical parameters, then the headlight control module 40 is further determined to have experienced a short circuit fault. If the luminous intensity of the target headlight is detected to be lower than the lower limit of the normal luminous intensity range, while the voltage and current are normal, the headlight control module 40 can determine that the headlight is working normally and does not perform any feedback processing.
[0041] As can be seen from the above embodiments, this embodiment, through multi-dimensional signal acquisition by the photosensitive module 10, the thermal module 20, and the electrical signal detection module 30, can achieve accurate diagnosis of vehicle headlight fault types. Specifically, the photosensitive module 10 can directly determine whether the bulb is emitting light normally by detecting the light intensity signal; the thermal module 20 can identify abnormal heat dissipation or short circuit hazards by monitoring the temperature changes of the target vehicle headlight; and the electrical signal detection module 30 locates circuit faults by analyzing electrical signal fluctuations. The headlight control module 40 integrates these three types of signals, breaking through the limitations of traditional binary detection and distinguishing between different types of vehicle headlight faults, thereby significantly improving the headlight fault detection effect.
[0042] In one possible implementation, Figure 2 This embodiment shows a schematic diagram of the specific structure of the vehicle headlight fault detection system provided. Figure 2 As shown, the electrical signal includes a voltage signal and a current signal; the electrical signal detection module 30 includes a current sensor 31 and a voltage sensor 32; the vehicle headlight fault detection system also includes a first comparison module U1, a second comparison module U2, a third comparison module U3 and a fourth comparison module U4; The inverting input terminal of the first comparison module U1 is connected to the output terminal of the photosensitive module, the non-inverting input terminal of the first comparison module U1 is used to connect to the light intensity reference signal, and the output terminal of the first comparison module U1 is connected to the vehicle lamp control module. The non-inverting input of the second comparison module U2 is connected to the output of the thermal module, and the inverting input of the second comparison module U2 is connected to the thermal reference signal; the output of the second comparison module U2 is connected to the vehicle lighting control module. The non-inverting input terminal of the third comparison module U3 is connected to the output terminal of the current sensor 31, the inverting input terminal of the third comparison module U3 is used to receive the current reference signal, and the output terminal of the third comparison module U3 is connected to the vehicle light control module. The inverting input terminal of the fourth comparison module U4 is connected to the output terminal of the voltage sensor 32, the non-inverting input terminal of the fourth comparison module U4 is used to receive the voltage reference signal, and the output terminal of the fourth comparison module U4 is connected to the vehicle light control module.
[0043] In this embodiment, the light intensity reference signal is the reference voltage signal corresponding to the standard light intensity of the vehicle headlight. When the actual light intensity decreases, causing the output voltage to be lower than the reference voltage signal, the first comparison module U1 outputs a high level. The non-inverting input of the second comparison module U2 is connected to the output of the thermistor module; the inverting input is connected to the thermistor reference signal, i.e., the reference voltage signal corresponding to the temperature threshold. When the temperature rises, causing the voltage output by the thermistor module to exceed the thermistor reference voltage, it outputs a high level. The non-inverting input of the third comparison module U3 is connected to the output of the current sensor 31, and the inverting input is connected to the current reference signal. It outputs a high level when there is an overcurrent. The inverting input of the fourth comparison module U4 is connected to the output of the voltage sensor 32, and the non-inverting input is connected to the voltage reference signal. It outputs a high level when there is an undervoltage.
[0044] In this embodiment, the light intensity reference signal can be reduced as the ambient light intensity collected by the ambient light sensor decreases, such as reducing the light intensity reference signal at night to avoid misjudgment. The temperature reference signal can be adjusted according to the vehicle's driving status. For example, the vehicle has high heat dissipation efficiency when driving at high speed, so the temperature reference signal value can be positively correlated with the vehicle speed.
[0045] As can be seen from the above embodiments, this embodiment achieves rapid hardware-level fault diagnosis by configuring four comparators and designing differentiated input polarities. The first comparator module U1 uses an inverting input to compare the light intensity signal with a reference value, and immediately outputs a high level when the light intensity is insufficient; the second comparator is connected to the temperature signal with a non-inverting input, and triggers an alarm when the temperature exceeds the limit; the third and fourth comparators monitor the overcurrent and undervoltage states of current / voltage, respectively. Each comparator works independently and directly outputs a digital signal to the vehicle lighting control module, eliminating the analog-to-digital conversion stage and improving response speed.
[0046] In one possible implementation, the headlight control module is configured to trigger a light decay fault in the target headlight when it receives a high-level signal from the first comparison module U1; trigger an overheating fault in the target headlight when it receives a high-level signal from the second comparison module U2; trigger an overcurrent fault in the target headlight when it receives a high-level signal from the third comparison module U3; and trigger an undervoltage fault in the target headlight when it receives a high-level signal from the fourth comparison module U4.
[0047] In this embodiment, a light decay fault is triggered when the first comparison module U1 outputs a high level, which may be caused by bulb aging, LED chip failure, or lamp cover damage. An overheating fault is triggered when the second comparison module U2 outputs a high level, which may be caused by poor heat dissipation, excessive current, or excessively high ambient temperature. An overcurrent fault is triggered when the third comparison module U3 outputs a high level, which may be caused by a short circuit in the headlight or breakdown of internal components. An undervoltage fault is triggered when the fourth comparison module U4 outputs a high level, which may be caused by damage to some bulbs, poor contact in the power supply line, or insufficient battery power.
[0048] Specifically, the headlight control module can sequentially detect the output signal of each comparison module through polling, while setting a high sampling rate to ensure real-time performance. To avoid false triggering, the headlight control module can only determine that a corresponding headlight fault has occurred after detecting a high level output from the same comparison module N consecutively. N is greater than or equal to 3.
[0049] As can be seen from the above embodiments, this embodiment can achieve accurate fault location by establishing a hard-wired mapping relationship between the comparator output level and the fault type. This mechanism allows the controller to classify the four types of core vehicle light faults without parsing complex analog quantities, simply by identifying high and low levels. The diagnostic latency is small, and the parallel processing architecture can ensure that multiple faults are reported simultaneously, avoiding missed reports caused by traditional polling mechanisms.
[0050] In one possible implementation, such as Figure 2 As shown, the vehicle headlight fault detection system also includes an AND gate 51; The first input terminal of the AND gate 51 is connected to the output terminal of the first comparison module U1, the second input terminal of the AND gate 51 is connected to the output terminal of the fourth comparison module U4, and the output terminal of the AND gate 51 is connected to the vehicle light control module. The vehicle light control module is used to trigger a partial lamp chip damage fault in the target vehicle light when it receives a high-level signal sent by the AND gate 51.
[0051] In this embodiment, the outputs of the first comparison module U1 and the fourth comparison module U4 are connected to the input of the AND gate 51. The first comparison module U1 outputs a high level when the light intensity is insufficient, and the fourth comparison module U4 outputs a high level when there is undervoltage. When both output a high level simultaneously, the AND gate 51 outputs a high level, triggering a "partial LED damage fault". Since partial LED damage leads to a decrease in overall light intensity, and changes in circuit resistance may cause insufficient voltage division for the remaining LEDs, triggering the fourth comparison module U4 to go high, the AND logic eliminates false positives such as insufficient light intensity due to lamp cover contamination or insufficient voltage due to power supply line problems, accurately locating the specific fault of "partial LED damage", thus improving the specificity and accuracy of fault detection.
[0052] As can be seen from the above embodiments, in this embodiment, when the first comparison module U1 and the fourth comparison module U4 simultaneously output a high level, AND gate 51 sends a high-level signal to the controller, triggering a "partial LED damage" fault. This structure accurately captures the common fault type in lamp groups where a single LED is open-circuited, resulting in a decrease in overall voltage and a reduction in light output. Through a dual-condition constraint mechanism, it effectively eliminates the problems of reduced light intensity caused by external LED obstruction and false undervoltage alarms caused by power supply failures. Compared to high-cost image recognition solutions, this embodiment achieves the same function with a single logic gate device, reducing costs and improving maintenance efficiency.
[0053] In one possible implementation, such as Figure 2 As shown, the vehicle headlight fault detection system also includes an OR gate 52; The first input terminal of the OR gate 52 is connected to the output terminal of the second comparison module U2, the second input terminal of the OR gate 52 is connected to the output terminal of the third comparison module U3, and the output terminal of the OR gate 52 is connected to the vehicle light control module. The vehicle light control module is used to trigger an overheating fault of the target vehicle light when it receives a high-level signal sent by the OR gate 52.
[0054] In this embodiment, when the headlight experiences circuit aging or overcurrent faults, its temperature will rise, triggering the second comparison module U2 to go high. At the same time, a short circuit in the headlight circuit or component aging will cause the current to increase, triggering the third comparison module U3 to go high. Since both overheating and overcurrent in the headlight will further worsen the headlight fault, this embodiment uses OR gate logic to ensure that any abnormality can trigger protection.
[0055] As can be seen from the above embodiments, this embodiment integrates temperature and current signals through OR gate 52 to construct a dual-redundancy judgment mechanism for overheating faults. Since current overload is the direct cause of overheating, and temperature rise is the final manifestation of overheating faults, this embodiment significantly improves the reliability of fault judgment through dual signals.
[0056] In one possible implementation, the vehicle headlight fault detection system further includes a second AND gate, one input of which is connected to the output of the third comparison module U3, and the other input is connected to the output of the fourth comparison module U4. The output is connected to the vehicle headlight control module. When the fourth comparison module U4 outputs a high level, the vehicle headlight control module determines that the target headlight has a short circuit fault.
[0057] In one possible implementation, the vehicle light fault detection system further includes a positioning module; the positioning module is used to detect the position information of the target vehicle light and send the position information of the target vehicle light to the vehicle light control module.
[0058] Specifically, the positioning module includes position sensors, which detect the position of each headlight and compare it with the vehicle's origin coordinates to determine the specific location of the headlight on the vehicle.
[0059] As can be seen from the above embodiments, the positioning module provided in this embodiment can accurately identify the physical location of the faulty vehicle light. By obtaining the location information of the target vehicle light, such as the left front low beam headlight and the right rear turn signal, the controller can bind the fault type with the specific location, avoiding maintenance personnel from checking each light individually and improving the positioning efficiency of the faulty vehicle light.
[0060] In one possible implementation, the headlight fault detection system further includes a body control module (BCM) and a vehicle control unit (VCU). The body controller is communicatively connected to the headlight control module 40, and the vehicle control module is communicatively connected to the body controller. The body controller is used to obtain the fault type sent by the headlight control module 40 and forward the fault type to the vehicle control module.
[0061] In this embodiment, the Body Controller (BCM) is the core module of the automotive electronic system responsible for managing the vehicle's electrical equipment and functions. Its core function is to enhance the vehicle's comfort, convenience, and safety by performing equipment control, safety monitoring, and power management, including intelligent lighting control. The BCM and the Microcontroller Unit (MCU) for lighting control can communicate via a CAN bus or a LIN bus.
[0062] The Vehicle Control Unit (VCU) is the core control unit of a vehicle, responsible for coordinating the operation of all subsystems and often referred to as the "brain of the car." Its core functions encompass power distribution, energy management, safety monitoring, and communication coordination, directly determining the vehicle's performance, fuel economy, and safety. The VCU can dynamically adjust the motor output torque by analyzing accelerator pedal signals, gear position signals, and battery status. The VCU communicates with the Body Controller (BCM) via CAN bus, LIN bus, and / or a gateway.
[0063] The headlight control module 40 forwards the fault type of the target headlight to the vehicle control module through the body controller, enabling the vehicle control module to perform subsequent fault prompts or intervention operations.
[0064] As can be seen from the above embodiments, this embodiment constructs a multi-level fault response mechanism through the body controller and the vehicle control module. The headlight control module 40 transmits the fault type to the vehicle control module through the body controller, providing signal support for corresponding safety strategies for subsequent headlight faults.
[0065] In one possible implementation, the system further includes: a display module; The display module is communicatively connected to the vehicle control module and is used to display the fault type of the target vehicle light.
[0066] In this embodiment, the display module may include an instrument panel, a central control screen, a fault indicator light, or a user's handheld terminal, such as a mobile phone or tablet. When a target vehicle light malfunctions, the fault type is displayed on the display module. For example, a pop-up window on the central control screen may display: "Turn signal overheating fault!!" Specifically, the vehicle control module and display module can communicate via CAN bus or via in-vehicle Ethernet. The vehicle control module communicates with the user's handheld terminal via Bluetooth, a dedicated network, or cellular data.
[0067] In this embodiment, the system may further include: a speaker; the speaker is communicatively connected to the vehicle control module and is used to announce the fault type of the target vehicle light.
[0068] Specifically, when a vehicle is in motion, if there is a headlight malfunction, the vehicle control module controls the display module to display the malfunction type of the target headlight. However, the user may not notice the malfunction in time due to being focused on driving. Therefore, while displaying the malfunction type of the target headlight on the display module, the malfunction type of the target headlight can be broadcast through the vehicle's speaker to prevent the driver from ignoring important malfunction types.
[0069] Specifically, to avoid interfering with the driver's driving by broadcasting all headlight malfunctions via voice, the vehicle control module can preset the types of headlight malfunctions that need to be broadcast through the vehicle's speakers. When the current headlight malfunction type belongs to the type of headlight malfunction that needs to be broadcast through the speakers, the malfunction type of that headlight will be broadcast through the vehicle's speakers. For example, open circuit, short circuit, or overheating malfunctions of signal lights.
[0070] In one possible implementation, the display module includes a dashboard; Upon receiving the fault type of the target vehicle light, the instrument panel illuminates the corresponding display symbol.
[0071] In this embodiment, displaying the fault type of the target headlight on the dashboard makes it easier for the driver to see the headlight fault while driving.
[0072] As can be seen from the above embodiments, this embodiment can intuitively display the type of target headlight fault through the display symbols on the dashboard; compared with traditional text alarms, the illumination of specific headlight symbols can allow the driver to instantly locate the fault location, such as the left headlight symbol flashing to indicate the corresponding headlight fault, reducing the risk of driver misjudgment and improving emergency handling efficiency.
[0073] In one possible implementation, the vehicle lights also include hazard warning flashers; The vehicle control module is also used to restrict the vehicle's transmission from shifting to a high gear and to activate the hazard warning lights when the target headlights overheat.
[0074] In this embodiment, when the vehicle lights experience open-circuit, short-circuit, overcurrent, or overheating faults, a serious traffic accident may occur if the driver ignores the fault and continues driving at high speed. Therefore, upon detecting the aforementioned faults, the vehicle control module can first issue a reminder to stop immediately, and then restrict the transmission from engaging high gears to prevent the vehicle from continuing to travel at high speeds. After power is restored, the vehicle light fault detection is repeated. If the fault is resolved, the restriction on high gears in the transmission is lifted.
[0075] Specifically, when a transmission includes multiple specific speed gears, such as an automatic transmission, a dual-clutch transmission, and a continuously variable transmission, the high-speed gear of the transmission can be the highest 20% gear. For example, when the total number of gears is 10, the transmission is limited to gears 9 and 10.
[0076] As can be seen from the above embodiments, this embodiment interlocks headlight malfunctions with the transmission, constructing an active safety protection system. When an overheating fault is detected in the headlights, the vehicle control module immediately restricts the transmission from entering high gears, preventing traffic accidents or serious loss of control of the power system caused by headlight circuit failures, and effectively avoiding potential electrical fire risks.
[0077] When the target headlight only experiences a fault that does not affect normal driving, such as light decay, dimming, or partial damage to lamp beads, the headlight control module 40 communicates with the body controller and vehicle control module and only displays the fault type on the display module to remind the driver to handle it in time, without intervening in the transmission.
[0078] In one possible implementation, the photosensor module 10 includes a photosensor.
[0079] Specifically, a photosensitive sensor is installed near or inside the target vehicle headlight, avoiding direct exposure to ambient light, to monitor the light intensity emitted by the target headlight in real time. The photosensitive sensor can directly detect the light intensity data of the target headlight. Specifically, the photosensitive sensor is a photoresistor; the stronger the light, the smaller the photoresistance. It can output a voltage signal through a voltage divider circuit, and the headlight control module 40 determines the light intensity data by monitoring the magnitude of the voltage signal.
[0080] Specifically, to avoid direct exposure to ambient light, the photosensitive sensor housing is equipped with a light shield to prevent other light sources from shining directly on it.
[0081] In this embodiment, the photosensor can also be a photodiode / transistor. A photodiode generates photogenerated carriers when illuminated, and its output current or voltage changes with the light intensity. The photosensor can also be an integrated ambient light sensor.
[0082] As can be seen from the above embodiments, this embodiment improves the detection accuracy of light intensity signals by detecting the light intensity signal of the target vehicle headlight using a photosensitive sensor.
[0083] In one possible implementation, the electrical signal detection module includes a current sampling module.
[0084] In this embodiment, the current sampling module can be a current transformer or a current sampling resistor.
[0085] When the current sampling module is a current sampling resistor, the current sampling resistor is connected in series in the circuit of the target vehicle light. By detecting the voltage value on both sides of the current sampling resistor, the current value flowing through the target vehicle light is determined.
[0086] In one possible implementation, the electrical signal detection module includes a voltage sampling module.
[0087] Specifically, the voltage sampling module can be a varistor, which utilizes the nonlinear characteristics of the varistor to reflect the input voltage fluctuation by measuring the changes in voltage or current across its terminals.
[0088] As can be seen from the above embodiments, this embodiment collects the current signal and voltage signal of the target vehicle lamp through the current sampling module and the voltage sampling module respectively. It can accurately determine the open circuit, short circuit and other circuit faults of the vehicle lamp by collecting the current signal and voltage signal, thereby improving the accuracy of fault type detection.
[0089] In one possible implementation, the thermistor module 20 includes a thermistor.
[0090] In this embodiment, the core principle of thermistor temperature detection is to utilize the characteristic that its resistance value changes significantly with temperature, and to indirectly calculate the temperature by measuring the resistance or voltage / current changes.
[0091] As can be seen from the above embodiments, this embodiment improves the reliability of the temperature signal by detecting the temperature signal of the target vehicle headlight using a thermistor.
[0092] In one possible implementation, the system further includes a spectral analysis sensor, which is communicatively connected to the vehicle lighting control module 40 and installed inside the target vehicle lighting unit. This sensor is used to collect real-time emission spectrum data of the target vehicle lighting unit, such as wavelength and color temperature. The spectral analysis sensor communicates with the vehicle lighting control module 40 via an I2C (Inter-Integrated Circuit) or SPI (Serial Peripheral Interface) interface, sending the emission spectrum data of the target vehicle lighting unit to the vehicle lighting control module 40. The vehicle lighting control module 40 compares the emission spectrum of the target vehicle lighting unit with a preset standard spectral range. If the spectrum of the target vehicle lighting unit deviates from the standard spectral range, it is determined to be a "color anomaly fault." The vehicle lighting control module (MCU) sends the color anomaly fault of the target vehicle lighting unit to the vehicle control module via a body sensor. The vehicle control module displays the color anomaly fault of the target vehicle lighting unit on the instrument panel. Simultaneously, the vehicle control module records the fault code corresponding to the color anomaly fault of the target vehicle lighting unit for subsequent maintenance and location. The aforementioned spectral analysis sensor can solve the color deviation problem that traditional brightness detection cannot identify, ensuring that the signal lights meet regulatory requirements.
[0093] In one possible implementation, the headlight fault detection system also includes a vibration detection module; The vibration detection module is installed on the base or PCB board of the target vehicle lamp and is communicatively connected to the vehicle lamp control module 40. It is used to monitor the vibration frequency of the target vehicle lamp when it is working and send the vibration frequency to the vehicle lamp control module 40. The vehicle lamp control module 40 compares the vibration frequency of the target vehicle lamp with the normal vibration frequency to determine whether the vibration frequency of the target vehicle lamp is abnormal. If the vibration frequency of the target vehicle lamp is abnormal and the current change rate of the target vehicle lamp exceeds the preset change rate threshold, then the target vehicle lamp has a poor contact fault.
[0094] When the headlight control module 40 detects a headlight contact failure, it sends the headlight contact failure information to the body controller. When the body controller detects a headlight contact failure, it restricts the vehicle from entering high-speed driving mode.
[0095] Specifically, the vibration detection module can be a piezoelectric vibration sensor. When the vehicle control module receives a fault indicating poor headlight contact, it displays the fault on the instrument panel and reminds the user to prevent headlight power loss. This embodiment, by incorporating a vibration detection module, provides early warning of physical connection problems, reducing the risk of sudden signal interruptions.
[0096] In one possible implementation, the vehicle headlight fault detection system also includes a humidity detection module; A humidity detection module is embedded in the cavity of the target vehicle lamp to detect the internal humidity. The humidity detection module communicates with the lamp control module 40, sending the internal humidity data to the lamp control module 40. The lamp control module 40 uses a humidity threshold to determine the internal humidity of the target vehicle lamp. If the internal humidity exceeds the threshold, it determines that the target vehicle lamp has excessive humidity, indicating a seal failure. When the lamp control module 40 detects a "lamp seal abnormality" fault, it reduces the drive current of the target vehicle lamp to prevent a short circuit.
[0097] Specifically, the humidity detection module can be a capacitive humidity sensor.
[0098] As can be seen from the above embodiments, by setting a humidity detection module, this embodiment can prevent short circuits or corrosion caused by moisture and extend the life of the lamps.
[0099] As can be seen from the above embodiments, when various vehicle lights malfunction, this embodiment can accurately analyze and detect the cause of the malfunction, not only to analyze the type of malfunction, but also to automatically intervene in the vehicle according to different malfunction types. It can automatically restrict the transmission from entering high gear and change the driver's subjective behavior, thereby enabling the driver to proactively and promptly replace and repair various signal lights, thereby reducing traffic accidents caused by this problem and improving vehicle driving safety.
[0100] Secondly, this application provides a vehicle comprising: a headlight fault detection system as described in any of the first aspects above.
[0101] The features of the embodiments shown in the accompanying drawings or the various embodiments mentioned in this specification should not be construed as independent embodiments. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the drawings.
[0102] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A vehicle headlight fault detection system, characterized in that, include: Photosensitive module, thermal module, electrical signal detection module, and vehicle lighting control module; The photosensitive module is used to detect the light intensity signal of the target vehicle's headlights; The thermal module is used to detect the temperature signal of the target vehicle light; The electrical signal detection module is used to detect the electrical signal when the target vehicle light is working; The vehicle headlight control module is used to detect the fault type of the target vehicle headlight based on the light intensity signal, the temperature signal, and the electrical signal; The target vehicle lights include headlights, signal lights, and auxiliary driving lights.
2. The vehicle headlight fault detection system according to claim 1, characterized in that, The electrical signal includes a voltage signal and a current signal; the electrical signal detection module includes a current sensor and a voltage sensor; the vehicle headlight fault detection system further includes a first comparison module, a second comparison module, a third comparison module, and a fourth comparison module; The inverting input terminal of the first comparison module is connected to the output terminal of the photosensitive module, the non-inverting input terminal of the first comparison module is used to connect to the light intensity reference signal, and the output terminal of the first comparison module is connected to the vehicle lamp control module. The non-inverting input of the second comparison module is connected to the output of the thermistor module, and the inverting input of the second comparison module is connected to the thermistor reference signal; the output of the second comparison module is connected to the vehicle lighting control module. The non-inverting input terminal of the third comparison module is connected to the output terminal of the current sensor, the inverting input terminal of the third comparison module is used to input the current reference signal, and the output terminal of the third comparison module is connected to the vehicle lighting control module. The inverting input terminal of the fourth comparison module is connected to the output terminal of the voltage sensor, the non-inverting input terminal of the fourth comparison module is used to receive a voltage reference signal, and the output terminal of the fourth comparison module is connected to the vehicle lighting control module.
3. The vehicle headlight fault detection system according to claim 2, characterized in that, The headlight control module is used to trigger a light decay fault of the target headlight when it receives a high-level signal from the first comparison module; to trigger an overheating fault of the target headlight when it receives a high-level signal from the second comparison module; to trigger an overcurrent fault of the target headlight when it receives a high-level signal from the third comparison module; and to trigger an undervoltage fault of the target headlight when it receives a high-level signal from the fourth comparison module.
4. The vehicle headlight fault detection system according to claim 2, characterized in that, The vehicle headlight fault detection system also includes AND gates; The first input terminal of the AND gate is connected to the output terminal of the first comparison module, the second input terminal of the AND gate is connected to the output terminal of the fourth comparison module, and the output terminal of the AND gate is connected to the vehicle light control module. The vehicle light control module is used to trigger a partial lamp chip damage fault in the target vehicle light when it receives a high-level signal sent by the AND gate.
5. The vehicle headlight fault detection system according to claim 2, characterized in that, The vehicle headlight fault detection system also includes an OR gate; The first input terminal of the OR gate is connected to the output terminal of the second comparison module, the second input terminal of the OR gate is connected to the output terminal of the third comparison module, and the output terminal of the OR gate is connected to the vehicle light control module. The headlight control module is used to trigger an overheating fault in the target headlight when it receives a high-level signal sent by the OR gate.
6. The vehicle headlight fault detection system according to claim 1, characterized in that, The vehicle headlight fault detection system also includes a positioning module; the positioning module is used to detect the position information of the target vehicle headlight and send the position information of the target vehicle headlight to the vehicle headlight control module.
7. The vehicle headlight fault detection system according to claim 1, characterized in that, The vehicle lighting fault detection system also includes a body controller and a vehicle control module; The body controller is communicatively connected to the headlight control module, and the vehicle control module is communicatively connected to the body controller. The body controller is used to obtain the fault type sent by the headlight control module and forward the fault type to the vehicle control module.
8. The vehicle headlight fault detection system according to claim 7, characterized in that, The vehicle lights also include hazard warning flashers; The vehicle control module is also used to restrict the vehicle's transmission from shifting to a high gear and to activate the hazard warning lights when the target headlights overheat.
9. The vehicle headlight fault detection system according to any one of claims 7 to 8, characterized in that, The system also includes: a display module; The display module is communicatively connected to the vehicle control module and is used to display the fault type of the target vehicle light.
10. A vehicle, characterized in that, Including the vehicle headlight fault detection system as described in any one of claims 1 to 9.